Preheat a fryer or wok filled 1/2 way with oil to 400 degrees. In a bowl, whisk together the flour, cornmeal, Old Bay and slowly add the soda until a pancake batter consistency is achieved. Dip each oyster in the batter and fry until golden brown, about 3 to 5 minutes. Season lightly with salt. Meanwhile, in a small bowl, mix together the vinegar, soy, chiles, sugar and sesame oil.
PLATING: Cover a large platter with greens and place a small bowl of dipping sauce in the middle. Surround with hot oysters.